KR20240001130A - Heat-resistant structures and members for heat treatment furnaces - Google Patents

Abstract

Provided is a heat-resistant structure that can be easily manufactured and that has excellent mechanical properties in a high-temperature environment and is unlikely to cause thermal deformation. It is provided with a core material (2) made of a plurality of C/C composite members (4), and a shell material (3) made of metal and covering at least a part of the surface (2a) of the core material (2). Heat-resistant structure (1).

Description

Heat-resistant structures and members for heat treatment furnaces

The present invention relates to a heat-resistant structure and a member for a heat treatment furnace using the heat-resistant structure.

Conventionally, metal materials have been widely used as members for heat treatment furnaces. However, metal bars have the problem of being heavy and prone to thermal deformation when used at high temperatures. Therefore, it is necessary to correct the deformation after use. Accordingly, as an alternative to such a metal bar, a bar disposed inside a metal pipe with a carbon fiber-reinforced carbon composite material (C/C composite) is being investigated.

For example, Patent Document 1 below discloses a heat-resistant structural member made of a heat-resistant metal material and carbon/carbon material. Patent Document 1 describes that a heat-resistant metal material constitutes an outer shell structure, and a carbon/carbon material constitutes a core member enclosed within the outer shell structure. Patent Document 1 describes the fact that helium gas is enclosed within the outer shell structure. Additionally, Patent Document 2 below describes a structure similar to Patent Document 1, characterized in that a reducing agent that reduces at least water and/or carbon oxide is encapsulated in the outer shell structure.

Patent Document 1: Japanese Patent Publication No. 2018-39708 Patent Document 2: Japanese Patent Publication No. 2017-77998

However, in the case of members in which C/C composite is placed inside a metal pipe, C/C composite with a large thickness is often required. However, the C/C composite has a problem in that the larger the thickness, the more difficult it is to manufacture and the lower the productivity. Additionally, in the case of C/C composites with large thickness, there is also a problem that manufacturing costs increase. In addition, after processing the C/C composite with a large thickness, the small-thick single material is discarded, which also poses an environmental problem.

The purpose of the present invention is to provide a heat-resistant structure that can be easily manufactured, has excellent mechanical properties in a high-temperature environment, and is unlikely to cause thermal deformation, and a member for a heat treatment furnace using the heat-resistant structure.

The heat-resistant structure according to the present invention is characterized by comprising a core material made of a plurality of C/C composite members, and a shell material that covers at least part of the surface of the core material and is made of metal, there is.

In the present invention, it is preferable that the core material is a laminate of the plurality of C/C composite members.

In the present invention, the shape of the C/C composite member is preferably a substantially rectangular plate shape.

In the present invention, it is preferable that the C/C composite member is a two-way C/C composite member.

In the present invention, when a load is applied to the heat-resistant structure, the direction in which the longest side in the cross section along the width direction of the C/C composite member extends is arranged to be substantially the same as the direction in which the load is applied. It is desirable to have

In the present invention, when applying a load to the heat-resistant structure, it is preferable that the plurality of C/C composite members are stacked in a direction substantially perpendicular to the direction in which the load is applied.

In the present invention, it is preferable that the shell material is a pipe made of metal, and that the pipe is filled with the plurality of C/C composite members.

In the present invention, it is preferable that the cross-sectional shape of the pipe is substantially polygonal.

In the present invention, the cross-sectional shape of the pipe may be approximately circular.

In the present invention, it is preferable that the thickness of the pipe is 0.1 mm or more and 3 mm or less.

In the present invention, it is preferable that the filling rate of the C/C composite member in the pipe is 70% or more.

In the present invention, it is preferable that the shell material partially covers the surface of the core material.

In the present invention, it is preferable that the heat-resistant structure is used in a non-oxidizing atmosphere.

The member for a heat treatment furnace according to the present invention is characterized by comprising a heat-resistant structure constructed according to the present invention.

According to the present invention, it is possible to provide a heat-resistant structure that can be easily manufactured and, furthermore, has excellent mechanical properties in a high-temperature environment and is unlikely to cause thermal deformation, and a member for a heat treatment furnace using the heat-resistant structure. Additionally, consideration for the global environment becomes possible through the use of small-thick single materials.

Figure 1 (a) is a schematic cross-sectional view along the longitudinal direction of the heat-resistant structure according to the first embodiment of the present invention, and Figure 1 (b) is a schematic cross-sectional view of the heat-resistant structure according to the first embodiment of the present invention. This is a schematic cross section that follows.
Figure 2 is a schematic cross-sectional view along the width direction of a heat-resistant structure according to a first modification example in the first embodiment of the present invention.
Figure 3 is a schematic cross-sectional view along the longitudinal direction of a heat-resistant structure according to a second modification of the first embodiment of the present invention.
Figure 4 is a schematic cross-sectional view along the width direction of the heat-resistant structure according to the second embodiment of the present invention.
Figure 5 is a schematic cross-sectional view along the width direction of the heat-resistant structure according to the third embodiment of the present invention.
Figure 6 is a schematic cross-sectional view along the width direction of the heat-resistant structure according to the fourth embodiment of the present invention.
Figure 7 is a diagram for explaining the lengths L1 and L2 in the heat-resistant structure according to the third embodiment of the present invention.
Figure 8 is a schematic perspective view showing a heat-resistant structure according to a fifth embodiment of the present invention.
Figure 9 is a schematic cross-sectional view along the width direction of the heat-resistant structure manufactured in Example 1.
Figure 10 is a schematic cross-sectional view along the width direction of the heat-resistant structure manufactured in Example 4.
Figure 11 is a schematic cross-sectional view along the width direction of the heat-resistant structure manufactured in Example 8.
Figure 12 is a schematic cross-sectional view along the width direction of the heat-resistant structure manufactured in Example 9.
Figure 13 is a schematic cross-sectional view along the width direction of the heat-resistant structure manufactured in Example 10.
Figure 14 is a schematic cross-sectional view along the width direction of the heat-resistant structure manufactured in Example 11.
Figure 15 is a schematic cross-sectional view along the width direction of the heat-resistant structure manufactured in Reference Example 1.

Hereinafter, the details of the present invention will be described.

(First Embodiment)

Figure 1(a) is a schematic cross-sectional view along the longitudinal direction of the heat-resistant structure according to the first embodiment of the present invention. 1(b) is a schematic cross-sectional view along the width direction of the heat-resistant structure according to the first embodiment of the present invention. In addition, the longitudinal direction of the heat-resistant structure 1 is the Z direction shown in Figures 1 (a) and (b). The width direction of the heat-resistant structure 1 is the Y direction shown in Figures 1 (a) and (b).

As shown in Figures 1 (a) and (b), the heat-resistant structure 1 includes a core material 2 and a shell material 3. The shell material 3 covers the surface 2a of the core material 2.

In this embodiment, the shell material 3 is a metal pipe. The inside of this shell material 3 is filled with a core material 2 made of four C/C composite members 4. Thereby, in this embodiment, the heat-resistant structure 1, which is a bar for a heat treatment furnace, is configured. Additionally, “C/C composite” refers to a carbon fiber reinforced carbon composite material. In this embodiment, as the C/C composite member 4, a 2-way C/C composite (2 DC/C composite) member with a two-dimensional structure is used.

In this embodiment, when applying a load to the heat-resistant structure 1, the load is applied in the direction of arrow ○ shown in FIG. 1(b). Therefore, in this embodiment, the direction in which the load is applied is the X direction shown in Figures 1 (a) and (b).

As shown in FIG. 1(b), the C/C composite members 4 constituting the core material 2 each have a substantially rectangular plate shape. In addition, in the cross section along the width direction Y, each C/C so that the direction in which the longest side 4a of the C/C composite member 4 extends is approximately the same direction as the A composite member 4 is disposed. Additionally, in this embodiment, the fiber direction of the C/C composite member 4 is also arranged to be substantially the same as the X direction to which the load is applied.

In addition, in this embodiment, each C/C composite member 4 is stacked so as to follow the Y direction substantially orthogonal to the X direction to which the load is applied. Thereby, the core material 2 is comprised in this embodiment. In addition, in this specification, the substantially same direction shall include not only the completely same direction but also a range tilted by ±5° with respect to the same direction. In addition, the substantially orthogonal direction shall include not only a completely orthogonal direction but also a range tilted by ±5° with respect to the orthogonal direction.

In the heat-resistant structure 1 of the present embodiment, as described above, the core material 2 composed of the C/C composite member 4 is provided inside the shell material 3, which is a metal pipe, so that the heat-resistant structure (1) The mechanical properties under the high temperature environment can be improved, and thermal deformation can be made difficult to occur. In addition, since a plurality of C/C composite members 4 can be disposed inside the shell material 3, the thickness of each C/C composite member 4 can be reduced. Since the heat-resistant structure 1 can be manufactured simply by arranging a plurality of these C/C composite members 4 inside the shell material 3, manufacturing is easy and productivity can be increased. Additionally, since the C/C composite member 4 with a thin thickness can be used, manufacturing costs can also be reduced.

In this embodiment, the cross-sectional shape of the metal pipe constituting the shell material 3 is approximately square. Naturally, the cross-sectional shape of the shell material 3 is not particularly limited, and may be substantially polygonal or substantially circular. Among these, it is preferable that the cross-sectional shape of the metal pipe is approximately rectangular, including a rectangular shape. In this case, the filling rate of the C/C composite member 4 can be further increased.

The thickness of the shell material 3 is not particularly limited, but is preferably 0.1 mm or more, and preferably 3 mm or less. When the thickness of the shell material 3 is within the above range, wear resistance against members such as other metals can be further improved.

Moreover, the material of the shell material 3 is not particularly limited, but for example, SUS can be used. Alternatively, a metal material that is difficult to react with SUS or carbon and is used for heat treatment may be used. This metal material is not particularly limited, and for example, STKMR (square steel pipe for machine structures), STPG (carbon steel pipe for pressure piping), etc. can be used.

In the heat-resistant structure 1 of this embodiment, four C/C composite members 4 are disposed inside the shell material 3. Naturally, the number of C/C composite members 4 disposed inside the shell material 3 is not particularly limited and can be appropriately determined depending on the thickness of the C/C composite member 4.

The number of C/C composite members 4 disposed inside the shell material 3 is preferably 2 or more, more preferably 3 or more, and preferably 6 or less, more preferably 5. It can be done as below.

The filling rate of the C/C composite member 4 disposed inside the shell material 3 is preferably 70% or more, more preferably 80% or more, and even more preferably 90% or more. In this case, mechanical properties in a high-temperature environment can be further improved, and thermal deformation can be made more difficult to occur. Additionally, the filling rate of the C/C composite member 4 disposed inside the shell material 3 may be 100%.

In the heat-resistant structure 1 of the present embodiment, as shown in FIG. 1(b), the thickness b of each C/C composite member 4 is the same thickness. The thickness b of the C/C composite member 4 is not particularly limited, but can be, for example, 0.5 mm or more and 12 mm or less.

Naturally, like the heat-resistant structure 1A of the first modification shown in FIG. 2, the thickness of each C/C composite member 4A, 4B may be different. In the first modification shown in FIG. 2, the thickness of the two C/C composite members 4A on the center side is thicker than the thickness of the four C/C composite members 4B on the end side.

In the heat-resistant structure 1 of the present embodiment, as shown in FIG. 1 (a), the entire surface 2a along the longitudinal direction Z of the core material 2 is covered with the shell material 3. On the other hand, the cross sections 2b and 2c are not covered by the shell material 3. Therefore, since the generated air escapes, the risk of rupture, etc. can be further reduced.

In addition, like the heat-resistant structure 1B of the second modification shown in FIG. 3, part of the shell material 3 may be cut out, or the shell material 3 may be disposed only at worn portions. In this case, the heat-resistant structure 1B can be further reduced in weight.

In the heat-resistant structure 1 of this embodiment, a mark may be made on the main surface 1a on which a load is applied. In addition, as a method of classifying the main surface 1a on which the load is applied, processing of pin holes, adjustment of the direction of the weld zone, processing of the metal pipe and C/C composite member 4, provision of a mark, etc. may be performed. In this case, the direction of use can be made more clear, and workability can be further improved.

In the heat-resistant structure 1 of this embodiment, a commercially available C/C composite member 4 can be used as the C/C composite member 4 constituting the core material 2. Additionally, the C/C composite member 4 may be manufactured and used by the following method.

Specifically, first, carbon fiber is impregnated with a thermosetting resin composition and then molded to obtain a molded body.

As carbon fiber, for example, polyacrylonitrile-based carbon fiber (PAN-based carbon fiber) or pitch-based carbon fiber can be used. As carbon fiber, it is preferable to use carbon fiber aligned in two directions to form a 2 DC/C composite. The thermosetting resin composition may be comprised solely of a thermosetting resin, or may contain a thermosetting resin and additives. The thermosetting resin composition may contain pitch. Additionally, the molded body is preferably formed by pultrusion. In this case, it is easier to align the carbon fibers in one direction, and a molded article with a higher carbon fiber volume content can be obtained. The shape of the molded body is not particularly limited, but can be, for example, a flat shape, an angled rod shape, or a round rod shape.

Additionally, 2 DC/C composite may be obtained by arranging prepreg impregnated with a thermosetting resin such as phenolic resin on a carbon fiber tow and molding it.

Next, the thermosetting resin composition is carbonized by firing the molded body to obtain a 2 DC/C composite.

The firing process is usually preferably performed in a non-oxidizing atmosphere such as a nitrogen gas atmosphere to prevent oxidation of the 2 DC/C composite during production.

The firing temperature is not particularly limited, but can be, for example, 700° or higher and 1300° or lower. The firing time is not particularly limited, but, for example, the maximum temperature holding time can be 30 minutes or more and 600 minutes or less.

Additionally, the pitch impregnation/baking process may be repeated to obtain a higher density 2 DC/C composite. The pitch impregnation/baking process can be repeated, for example, one or more times and 10 or fewer times.

In the present invention, a densification step may be further provided to densify at least part of the open pores in the 2 DC/C composite. In this case, oil penetration and oxidation consumption can be further suppressed.

As a densification process, for example, a process of impregnating the open pores of 2 DC/C composite with pitch or a thermosetting resin and carbonizing them can be used.

The densification process may be a process of performing CVI treatment.

The densification process may be a process of impregnating the open pores of the 2 DC/C composite with molten silicon and performing silicon carbide.

Additionally, the densification process may be a process of impregnating the open pores of the 2 DC/C composite with aluminum phosphate and performing heat treatment.

These densification processes may be used individually, or a plurality of processes may be used in combination.

(2nd to 4th embodiments)

Figure 4 is a schematic cross-sectional view along the width direction of the heat-resistant structure according to the second embodiment of the present invention. As shown in Fig. 4, also in the heat-resistant structure 21, four C/C composite members 24A to 24D are arranged within the shell material 3. Each C/C composite member 24A to 24D is the same size and has a substantially square cross-sectional shape. In addition, 2 DC/C composite members (24A, 24C) whose fiber direction is approximately in the same direction as the X direction to which the load is applied, and 2 DC/C composite members (24A, 24C) whose fiber direction is approximately orthogonal to the 24B, 24D) are arranged adjacent to each other. Other points are the same as the first embodiment.

Figure 5 is a schematic cross-sectional view along the width direction of the heat-resistant structure according to the third embodiment of the present invention.

As shown in Fig. 5, in the heat-resistant structure 31, five C/C composite members 34A to 34E are arranged within the shell material 3. In the heat-resistant structure 31, four approximately rectangular C/C composite members 34B to 34E are arranged to surround one approximately square C/C composite member 34A in cross section. In addition, the C/C composite members 34B, 34D whose longest side extends and the fiber direction are approximately in the same direction as the C/C composite members 34C and 34E in the Y direction that are substantially orthogonal are arranged adjacent to each other. Other points are the same as the first embodiment.

Figure 6 is a schematic cross-sectional view along the width direction of the heat-resistant structure according to the fourth embodiment of the present invention.

As shown in FIG. 6, in the heat-resistant structure 41, two C/C composite members 44 are disposed within the shell material 3. In the heat-resistant structure 41, each C/C composite member 44 is arranged so that the longest side extends and the fiber direction is in the Y direction, which is approximately orthogonal to the X direction in which the load is applied. Other points are the same as the first embodiment.

As shown in the second to fourth embodiments, in the present invention, the position of each C/C composite member in the shell material is not particularly limited. In either case, since a core material composed of a C/C composite member is provided inside the shell material, which is a metal pipe, the mechanical properties of the heat-resistant structure in a high-temperature environment can be improved, and thermal deformation can be made difficult to occur. there is. Additionally, since a plurality of C/C composite members can be disposed inside the shell material, the thickness of each C/C composite member can be reduced. Since the heat-resistant structure can be manufactured simply by arranging a plurality of such C/C composite members inside the shell material, it is easy to manufacture and productivity can be increased. Additionally, since thin C/C composite members can be used, manufacturing costs can also be reduced.

Naturally, in the present invention, for example, as shown in Figure 1 (b), it is preferable to arrange so that the direction in which the longest side (a) extends is approximately the same direction as the X direction in which the load is applied. . In this case, the mechanical properties of the heat-resistant structure 1 in a high-temperature environment can be further improved, and thermal deformation can be made more difficult to occur.

In addition, when the cross-sectional shape of the heat-resistant structure is substantially rectangular, as shown in FIG. 7, the length L1 along the The ratio (L1/L2) of the length L2 along the In this case, the mechanical properties of the heat-resistant structure 31 in a high-temperature environment can be further improved, and thermal deformation can be made more difficult to occur. In addition, the length L1 is the length of the C/C composite members (34B, 34D) that have the longest length along the It is done as follows. The ratio (L1/L2) is, for example, 1 in the first embodiment shown in Fig. 1(a) and (b), and is 0.5 in the second embodiment shown in Fig. 4.

In addition, in plan view, the ratio (S1/S2) between the area S1 where the C/C composite members 34B and 34D having the length L1 are arranged and the entire area S2 of the main surface 1a to which the load is applied is, Preferably it is 0.5 or more, more preferably 0.75 or more, and even more preferably 1. In this case, the mechanical properties of the heat-resistant structure 31 in a high-temperature environment can be further improved, and thermal deformation can be made more difficult to occur.

In addition, as shown in FIG. 7, when the C/C composite member 34A has the second longest length along the Preferably it is 0.25 or more, more preferably 0.5 or more, and preferably 0.75 or less. In this case, the mechanical properties of the heat-resistant structure 31 in a high-temperature environment can be further improved, and thermal deformation can be made more difficult to occur.

In addition, in plan view, the ratio (S3/S2) between the area S3 where the C/C composite member 34A having the length L3 is disposed and the entire area S2 of the main surface 1a to which the load is applied is preferably It is 0.5 or more, preferably 1 or less. In this case, the mechanical properties of the heat-resistant structure 31 in a high-temperature environment can be further improved, and thermal deformation can be made more difficult to occur.

In addition, as in the second embodiment shown in FIG. 4, when the ratio (L1/L2) is relatively small, the C/C composite members 24A to 24D may be fixed to each other by adhesive, pin fixation, or screw fixation. do. In addition, both ends of the shell material 3 may be welded so as not to be completely sealed, and both ends of the C/C composite members 24A to 24D may be fixed. In this case, the mechanical properties of the heat-resistant structure 21 in a high-temperature environment can be further improved, and thermal deformation can be made more difficult to occur.

(Fifth Embodiment)

Figure 8 is a schematic perspective view showing a heat-resistant structure according to a fifth embodiment of the present invention. As shown in FIG. 8, the heat-resistant structure 51 is a basket for a heat treatment furnace. The heat-resistant structure 51 is similar to the heat-resistant structure 1 of the first embodiment, and is constructed by filling the inside of the shell material 3 with a core material 2 made of four C/C composite members 4. It is done.

Also in the heat-resistant structure 51, since a core material composed of a C/C composite member is provided inside the shell material, which is a metal pipe, the mechanical properties of the heat-resistant structure 51 in a high-temperature environment can be improved, and heat resistance can be improved. It can make it difficult to cause deformation. Additionally, since a plurality of C/C composite members can be disposed inside the shell material, the thickness of each C/C composite member can be reduced. Since the heat-resistant structure 51 can be manufactured simply by arranging a plurality of such C/C composite members inside the shell material, it is easy to manufacture and productivity can be increased. Additionally, since thin C/C composite members can be used, manufacturing costs can also be reduced.

In this way, the heat-resistant structure of the present invention can be suitably used as heat treatment members such as heat treatment furnace bars, heat treatment furnace trays, and heat treatment furnace baskets.

Next, the present invention will be clarified by giving specific examples and comparative examples of the present invention. Additionally, the present invention is not limited to the following examples.

(Example 1)

In Example 1, a heat-resistant structure 61 (bar for heat treatment furnace) having a cross-sectional structure shown in FIG. 9 was produced. Specifically, a 1 mm thick SUS square pipe (19 mm An angled bar (17 mm x 8.5 mm x 700 mm) manufactured by Toyo Tanso Corporation, product number "CX-761", was inserted to obtain a heat-resistant structure 61. Additionally, the load direction is indicated by arrow ○ in the drawing.

(Example 2)

In Example 2, a heat-resistant structure 1 (bar for heat treatment furnace) having the cross-sectional structure shown in FIG. 1 was produced. Specifically, inside the same SUS square pipe as in Example 1, four 2 DC/C composite members 4 (manufactured by Toyo Tanso Corporation, product number "CX-761", square bar (17 mm × 4.25 mm × 700 mm)) ) was inserted to obtain the heat-resistant structure (1).

(Example 3)

In Example 3, a heat-resistant structure 1A (bar for heat treatment furnace) having the cross-sectional structure shown in FIG. 2 was produced. Specifically, inside the same SUS square pipe as in Example 1, two 2 DC/C composite members (4A) (manufactured by Toyo Tanso Corporation, product number "CX-761", square rod (17 mm x 4.25 mm x 700 mm)) ) and four 2 DC/C composite members (4B) (manufactured by Toyo Tanso Corporation, product number “CX-761”, angled bar (17 mm x 2.125 mm x 700 mm)) were inserted to obtain a heat-resistant structure (1A).

(Example 4)

In Example 4, a heat-resistant structure 71 (bar for heat treatment furnace) having a cross-sectional structure shown in FIG. 10 was produced. Specifically, inside the same SUS square pipe as in Example 1, eight 2 DC/C composite members 74 (manufactured by Toyo Tanso Corporation, product number "CX-761", angled bar (17 mm x 2.125 mm x 700 mm)) ) was inserted to obtain a heat-resistant structure (71).

(Example 5)

In Example 5, a heat-resistant structure 31 (bar for heat treatment furnace) having the cross-sectional structure shown in FIG. 5 was produced. Specifically, inside the same SUS square pipe as in Example 1, one 2 DC/C composite member (34A) (manufactured by Toyo Tanso Corporation, product number "CX-761", square bar (8.5 mm x 8.5 mm x 700 mm) )), and four 2 DC/C composite members (34B to 34E) (manufactured by Toyo Tanso Corporation, product number “CX-761”, angled bar (12.75 mm x 4.25 mm x 700 mm)) are inserted to form a heat-resistant structure (31). got it

(Example 6)

In Example 6, a heat-resistant structure 41 (bar for heat treatment furnace) having the cross-sectional structure shown in FIG. 6 was produced. Specifically, inside the same SUS square pipe as in Example 1, two 2 DC/C composite members 44 (manufactured by Toyo Tanso Corporation, product number "CX-761", angled bar (17 mm x 8.5 mm x 700 mm)) ) was inserted to obtain a heat-resistant structure (41).

(Example 7)

In Example 7, a heat-resistant structure 21 (bar for heat treatment furnace) having a cross-sectional structure shown in FIG. 4 was produced. Specifically, inside the same SUS square pipe as in Example 1, four 2 DC/C composite members (24A to 24D) (manufactured by Toyo Tanso Corporation, product number "CX-761", square bar (8.5 mm x 8.5 mm) ×700 mm)) was inserted to obtain a heat-resistant structure (21).

(Example 8)

In Example 8, a heat-resistant structure 81 (bar for heat treatment furnace) having a cross-sectional structure shown in FIG. 11 was produced. Specifically, inside the same SUS square pipe as in Example 1, eight 2 DC/C composite members 84 (manufactured by Toyo Tanso Corporation, product number "CX-761", angled bar (8.5 mm x 4.25 mm x 700 mm) )) was inserted to obtain a heat-resistant structure (81).

(Example 9)

In Example 9, a heat-resistant structure 91 (bar for heat treatment furnace) having a cross-sectional structure shown in FIG. 12 was produced. Specifically, inside the same SUS square pipe as in Example 1, two 2 DC/C composite members (94A) (manufactured by Toyo Tanso Corporation, product number "CX-761", square rod (17 mm × 4.25 mm × 700 mm)) ) and four 2 DC/C composite members (94B) (manufactured by Toyo Tanso Corporation, product number “CX-761”, angled bar (8.5 mm x 4.25 mm x 700 mm)) were inserted to obtain a heat-resistant structure (91).

(Example 10)

In Example 10, a heat-resistant structure 101 (bar for heat treatment furnace) having a cross-sectional structure shown in FIG. 13 was produced. Specifically, inside the same SUS square pipe as in Example 1, two 2 DC/C composite members (104A) (manufactured by Toyo Tanso Corporation, product number "CX-761", square bars (17 mm x 4.25 mm x 700 mm)) ) and four 2 DC/C composite members (104B) (manufactured by Toyo Tanso Corporation, product number “CX-761”, angled bar (8.5 mm x 4.25 mm x 700 mm)) were inserted to obtain a heat-resistant structure (101).

(Example 11)

In Example 11, a heat-resistant structure 111 (bar for heat treatment furnace) having a cross-sectional structure shown in FIG. 14 was produced. Specifically, inside the same SUS square pipe as in Example 1, two 2 DC/C composite members (114A) (manufactured by Toyo Tanso Corporation, product number "CX-761", square rod (17 mm × 4.25 mm × 700 mm)) ) and four 2 DC/C composite members (114B) (manufactured by Toyo Tanso Corporation, product number “CX-761”, angled bar (8.5 mm x 2.125 mm x 700 mm)) were inserted to obtain a heat-resistant structure (111).

(Reference Example 1)

In Reference Example 1, a heat-resistant structure 121 (bar for heat treatment furnace) having a cross-sectional structure shown in FIG. 15 was produced. Specifically, inside the same SUS square pipe as in Example 1, one 2 DC/C composite member 124 (manufactured by Toyo Tanso Corporation, product number "CX-761", angled bar (17 mm x 17 mm x 700 mm)) was inserted to obtain the heat-resistant structure 121.

(Comparative Example 1)

In Comparative Example 1, an angled SUS bar (19 mm x 19 mm x 700 mm) without the 2 DC/C composite member inserted was used.

[evaluation]

The structures of Examples 1 to 11, Reference Example 1, and Comparative Example 1 were heated at 900°C for 5 hours in an electric furnace with both ends supported at a span of 600 mm in the load direction and a 30 kg weight suspended in the center. did. After cooling, the weight was removed and the amount of deflection was measured.

The results are shown in Table 1 below. In addition, in Examples 1 to 11, the ratio between the length L1 of the longest side along the X-direction to which the load is applied in the C/C composite member and the length L2 along the /L2) is also shown. In addition, in Examples 5, 9 to 11, the length L3 of the second longest side along the X-direction to which the load is applied in the C/C composite member, and the length L2 along the It also shows the ratio (L3/L2).

[Table 1]

As is clear from Table 1, it was confirmed that the heat-resistant structures obtained in Examples 1 to 11 had superior mechanical properties in a high-temperature environment compared to the SUS square bar of Comparative Example 1, and that thermal deformation was less likely to occur. Among them, it was confirmed that in Examples 1 to 4 where the ratio (L1/L2) was 1, almost equivalent mechanical properties were obtained compared to Reference Example 1 using one thick 2 DC/C composite member 124. .

1, 1A, 1B, 21, 31, 41, 51, 61, 71, 81, 91, 101, 111, 121… heat resistant structure
1a… If you give it
2… heartwood
2a… surface
2b, 2c... section
3… shell material
4, 4A, 4B, 24A~24D, 34A~34E, 44, 64, 74, 84, 94A, 94B, 104A, 104B, 114A, 114B, 124... C/C composite member
4a… excreta

Claims (14)

A core material composed of a plurality of C/C composite members,
A heat-resistant structure comprising a shell material that covers at least part of the surface of the core material and is made of metal. In claim 1,
A heat-resistant structure wherein the core material is a laminate of the plurality of C/C composite members. In claim 1 or claim 2,
A heat-resistant structure wherein the C/C composite member has a substantially rectangular plate shape. The method according to any one of claims 1 to 3,
A heat-resistant structure, wherein the C/C composite member is a two-way C/C composite member. The method according to any one of claims 1 to 4,
When applying a load to the heat-resistant structure,
A heat-resistant structure arranged so that the direction in which the longest side of the cross section along the width direction of the C/C composite member extends is substantially the same direction as the direction in which the load is applied. The method according to any one of claims 1 to 5,
When applying a load to the heat-resistant structure,
A heat-resistant structure in which the plurality of C/C composite members are stacked in a direction substantially perpendicular to the direction in which the load is applied. The method according to any one of claims 1 to 6,
The shell material is a pipe made of metal,
A heat-resistant structure in which the plurality of C/C composite members are filled in the pipe. In claim 7,
A heat-resistant structure in which the cross-sectional shape of the pipe is substantially polygonal. In claim 7,
A heat-resistant structure wherein the cross-sectional shape of the pipe is approximately circular. The method according to any one of claims 7 to 9,
A heat-resistant structure wherein the pipe has a thickness of 0.1 mm or more and 3 mm or less. The method of any one of claims 7 to 10,
A heat-resistant structure wherein the filling rate of the C/C composite member in the pipe is 70% or more. The method according to any one of claims 1 to 6,
A heat-resistant structure in which the shell material partially covers the surface of the core material. The method according to any one of claims 1 to 12,
A heat-resistant structure used in a non-oxidizing atmosphere. A member for a heat treatment furnace, comprising the heat-resistant structure according to any one of claims 1 to 13.

Images